Banshee Running Real Crappy (Need Help ASAP)

[superdave]

I just went through this.....oil out the right side exhaust is a right crank seal....running bad and not consistant on the left side is a left crank seal.....I pulled the bottom of the motor off and changed both...runs great....just an FYI...D

[Infamous039]

Checked Reeds and they were not broken. I believe that it was the left crankseal also, I havent openend the crankcase yet. When I spark carb cleaner down there it doesn rev up it stays the same?????

[Blacksmith]

OK, well as we all know it only takes fuel, air, compression, and spark for a Banshee to run. Famous tells us that the compression is fine. While I would like to know the exact numbers, as well as what type of guage was used, we will assume that we do not have a compression problem.

Next comes spark. One thing that jumps out to me quick is that I never saw that this bike has had the TORS removed. If it has not, then the first thing to do is unplug the TORS control box. It is mounted on the frame almost directly above the left spark plug. Now because the problem stays on the left side regardless of which spark plug wire is attached to that plug, we can pretty much rule out an electrical problem. If a coil, plug wire, or plug boot was falling down the probem would move back and forth. So, in the spark world, that only leaves the plug. Now I am going to assume that the plug has been changed, as I am sure that anyone would try that before they would post a question like this one. If you have not tried a new plug, please do so now, but do not tell me about it. LOL

Next let up look to air for our problem. Is the air cleaner clean? Is there an old rag in the the cleaner to carb boot? Don't laugh I have seen it happen. Is there any obstruction or problem that would cause the amount of air flowing into the left side? Does the left side carb slide move up and down after the bike warms up and that side quites running? Remember that the slides control air flow. If there is nothing to stop or hinder the air flow INTO the left cylinder then we need to check that we do not have an exaust blockage on that side? Check you pipes out to see if there is any type of a problem there. If not, we need to move on.

The final item we have left to check is fuel. Because the bike will run ok when it is cold, and because we have fuel spitting out of the exaust, we know that we are getting some fuel. I can think of a couple of things in or relating to a carb that could cause this problem, missing main jet, bad choke seal, bad float adjustment, and I have no way to look at these issues of you. So, my advice, if you have gotten to this point, without finding a solution, would be to borrow a set of carbs off of a friends bike and try them. If that fixes your problem, then go through the left carb again and find that problem. It is there.

 

Good Luck, Ride Hard.

[Infamous039]

The Banshee Is running again and better than ever. Well my carbs needed to be rejeted and my wires had a short in it. Also some things had to be unplugged on the wire harness. The Banshee is firing on both cylinders and running good. Thanx to everyone who gave there input on helping me, I really appreciate it.